Using/ Running App harmful to fully charged and plugged in?

Nov 20, 2011
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Hi,

A quick question.

Is running an app while my batt is fully charged and still plugged in harmful to my iPhone 4s battery?

Will the rate of wear and tear of the battery thereforee be increased or will the power source be directed away from the battery and into the circuit board directly.

Thank You for your time and replies.